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Date: 11 Nov 2003 11:06:28 -0500
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Subject: Re: Strangeness at the drive naming and numering
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Sergey Zaikov <Sergey_Zaikov@p66.f5.klax.tsu.tula.ru> writes:

>                    Hello, Questions@freebsd.Org!!!
> 
> Sametimes ago I has two hard drives:
> 
> Oct 30 08^34^06 acc |kernel^ ad0^ 38162MB <Maxtor 6E040L0> [77536|16|63] at
> ata0-master UDMA33
> Oct 30 08^34^06 acc |kernel^ ad1^ 38166MB <ST340016A> [77545|16|63] at
> ata1-slave UDMA33
> 
> Is all correct? I think that the names must be ad0 and ad3.
> 
> Later, I has connected a CD-ROM:
> 
> Nov  4 13^45^14 acc |kernel^ ad0^ DMA limited to UDMA33? non-ATA66 cable or
> device
> Nov  4 13^45^14 acc |kernel^ ad0^ 38162MB <Maxtor 6E040L0> [77536|16|63] at
> ata0-master UDMA33
> Nov  4 13^45^14 acc |kernel^ ad1^ 38166MB <ST340016A>[77545|16|63] at
> ata1-slave UDMA33
> Nov  4 13^45^14 acc |kernel^ acd0^ CDROM <ATAPI CD-ROM DRIVE 40X MAXIMUM> at
> ata0-slave PIO4
> 
> Well, nothing strange.
> 
> Than I try using the ATAPI/CAM Driver (according Handbook: 12.5.9 Using the
> ATAPI/CAM Driver). Rebuild and install new kernel.
> 
> Than I see:
> The drive "ad1" be named as "ad3"!
> 
> What I do wrong?

What's the problem?  The second ATA disk in a system is normally named ad1.
There's a kernel option to "wire down" the names to specific spots on
the IDE buses, but that option is not used by default.